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The effects of the depth of ether anesthesia for surface-induced hypothermia on hemodynamics and blood gas were experimentally studied in the adult Beagle dogs. The dogs were classified into 3 groups according to the depth of ether anesthesia; group I (middle), group II (deep), and group III (light). Severe arrhythmia was found in groups II and III, and 6 dogs (66.7%) of group II died of ventricular fibrillation or standstill. During hypothermia, hemodynamic changes of groups I and II were significantly milder than those of group II. Aortic mean pressure of group I was maintained higher than that of group III, and the difference was especially significant at the esophageal temperature of 20•Ž (p<0.01). From these results, the ether anesthesia in group I seemed to be superior to that of other groups. Under this level of ether anesthesia, the mean blood ether concentration was 153 mg/dl at the esophageal temperature of 20•Ž. Moreover, because a good correlation was noted between blood pH or BE and blood ether concentration, it seemed that they were better indicators of the depth of ether anesthesia.

The Effects of Ether Anesthesia for Surface-Induced Hypothermia on Cardiopulmonary Function in the Dog